Water-leg for boilers.



1. Lusk.

WATER LEG FOR BOILERS. APPLICATION FILED JAN. 10. I916- Patented Dec, 11,1911

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banana wanna-tire iron nortnias.

flpecification of Letters Patent.

Patented Dec. 11, 19117.

Application filed January 10, 1916. Serial No. lifted.

To all whom it may concern:

lie it known that l, .lornv Loss, of the town of lranscona, in the Province of Manitoba, Canada, have invented certain new and useful improvements in Water -Legs for Boilers, of which the following is the specification.

The invention relates to improvements in water legs for boilers, particularly for locomotive boilers, and the principal object of the invention is to provide a water leg in. the fire chamber which passes lengthwise of the the chamber and across the grates and effects a division of the coal on the grates, and thereby allows of the comparatively free entrance of heated air through the center of the lire and in so doing effects more complete combustion and overcomes, to a marked extent, smoke in the fire chamber. fl. further object of the invention is, while accomplishing the above object, to provide, by virtue of the leg, an increased water circulation in the boiler. A still. further object of the invention is to construct a water leg which can be readily applied in the present form of locomotive boiler furnaces.

With the above objects in view the invention consists essentially in an upstanding water leg located centrally of the fire chamher and passing lengthwise thereof between the front and back water legs of the boiler and located above the customary center arm of the mud ring and means for admitting steam to the furnace through the leg, the parts being arranged and constructed as hereinafter more particularly described and later pointed out in the appended claim, reference being had to the accompanying drawing in which;

Figure 1 represents a longitudinal sectional view through a furnace fitted with my invention.

l ig. 2 represents a horizontal sectional view through the leg, the section being taken in the plane denoted by the line XK ll ig. 1.

Fig. 3 represents an enlarged detailed longitudinal sectional. view through the leg which ll supply.

ll ig. 4 represents an enlarged detailed vertical sectional view through the grates and leg, the section being taken in the plane denoted by the line l -Y lFig. l.

in the drawing like characters of reference indicate corresponding parts in each figure.

1 represents the barrel. of a boiler, 2 the steam dome, 3 the top sheet, lthe outside face plate, 5 and 6 the front and back fur-- nace sheets respectively, and i" the crown sheet of the furnace.

8 and 9 represent the usual grate bars carried by pair of end trunnions 8 and 9 mounted in the side pairs of grate support ing bars 10 and 11, 12 and 1.3 which are permanently fastened in the usual way to the sides of the mud ring 1+1. which, as is usual, is of a rectangularshape and is fitted, centrally, with a longitudinally disposed arm 15.

16 and 1'? represent the usual front and rear water legs of the boiler.

The above parts are all of ordinary construction and for this reason it is considered unnecessary to herein enter into a fllllllel' tlbscription of them.

The water leg which 1 supply islocated directly above the cent a1 arm 15 of the mud ring and passes between the front and rear water legs. This central water leg is indicated in the drawing by the reference 11umoral 18, and it will be noticed that the base of it appears between the grate bars 8 and 9, that the ends thereof communicate directly with the front and rear water legs 16 and 17 and that it effects a division of the coal, indicated at A, in the furnace. Actually, the leg is formed from a metallic plate bent into a ill-shaped cross section and when the plate is installed in position the edges thereof are fastened between the sides of the arm 15 and the adjacent grate supporting bars, while the ends thereof are flanged and permanently riveted to the front and back furnace sheets. I desire also to have the leg gradually increasing in cross sectional. area toward the center.

19 and 20 represent steam nozzles opening to the furnace through the leg which I supply. These are connected in any desirable way at the underside of the mud ring with a suitable source of steam supply, so that steam can be admitted through the leg to the fire when desired.

With this leg supplied, as explained, I have increased combustion in the fire chamber and consequently less smoke. Under ordinary conditions, that is, where no such leg is supplied, there is incomplete combustion and consequently considerable smoke, for the reason that there is only a limited supply of heated air available, the major portion of which riot.

Bil

finds its Way through the fire at the sides,

but little passing actually through the body of the fire. VVitha leg such as mine inserted not only is the heated air passed through the fire at the sides, but it is also admitted more or less freely through the fire adjacent the sides of the leg, where it is most needed. The result is that combustion is supported in a proper manner and there is an even fire on the grates. By so additionally supporting combustion I avoid the accumulation of smoke and obtain the full advantage of the fire on the grates.

The above is to be considered the principal object of the invention, but it is obvious that by having a water leg in this location an increased circulation of the water, in the boiler, is effected.

It is a well known fact, to one familiar with furnaces, that adjacent the water leg in a furnace there is always a freer passage of air than in any other location through the fire. My leg admits further air in a most desirable location, that is, at the center of the fire, and it is obvious that the air, in passing upwardly, will be brought to the proper temperature to properly support combustion.

In connection with the steam nozzles it is explained that these are only utilized to inject steam to the fire when the engine is closed down, so to speak, that is, when there is no forced air draft through the grates. At such time steam is admitted to the grates to support the combustion.

VVhat'I claim as my invention is In a locomotive boiler the combination with the front and rear water logs, the mud ring having a centrally located, longitudinally disposed arm and the furnace grate JOHN LUSK.

In the presence of Gr. L. ROXBURGH, S. SILVERT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Yatcnts. Washington, D. C. 

